Glass fiber-reinforced styrene copolymers

Abstract

A thermoplastic molding material comprising (A) a copolymer composed of acrylonitrile plus styrene, a-methylstyrene or a nuclear-substituted styrene derivative or mixtures of these three monomers; (B) a graft copolymer prepared either by (B 1 ) emulsion polymerization of a monomer mixture, based on either styreneacrylonitrile or styreneacrylonitrile-methyl methacrylate, on a latex, obtained as an emulsion, of an elastomer based on butadiene or acrylic ester as a grafting base, or by (B 2 ) solution polymerization of a monomer mixture, based on either styreneacrylonitrile or styreneacrylonitrile-methyl methacrylate, on an elastomer, prepared in solution, based on butadiene or acrylic ester or an EPDM elastomer as grafting base; (C) a. reinforcing agent based on an inorganic glass; and (D) a copolymer composed of (D 1 ) units of the formula I, ##STR1## in which R 1 and R 2 are hydrogen or methyl and R 3 is hydrogen, C 1 -C 8 alkyl, C 5 -C 12 cycloalkyl, C 6 -C 16 aryl or C 1 -C 14 aralkyl, and (D 2 ) units derived from a copolymerizable monomer selected from styrene, α-methylstyrene, (meth)acrylonitrile or (meth)acrylic acid esters.

We claim: 
     
       1. A thermoplastic molding material comprising, based on the sum of A, B, C and D, A: 30 to 95% by weight of a copolymer A comprising, in each case, based on A a 1  : 50 to 95% by weight of styrene, α-methylstyrene, a nuclear-substituted styrene derivative or mixtures of these monomers (a 1 ) and   a 2  : 5 to 50% by weight of acrylonitrile (a 2 )     B: up to 60% by weight of a graft copolymer B b 1  : prepared either by emulsion polymerization of, based on B, 15 to 85% by weight of a monomer mixture based either on   b 11  : styrene-acrylonitrile in the ratio 9:1 to 4:6, or   b 12  : styrene-acrylonitrile-methyl methacrylate in the ratio 19:1:0 to 8:6:6 on 15 to 85% by weight of a latex, obtained as an emulsion, of an elastomer based on butadiene or acrylic ester as grafting base; or by   b 2  : solution polymerization of, based on B, 15 to 85% by weight of a monomer mixture based on   b 21  : styrene-acrylonitrile in the ratio 9:1 to 4:6 or   b 22  : styrene-acrylonitrile-methyl methacrylate in the ratio 19:1:1 to 8:6:6 on 15 to 85% by weight of an elastomer, prepared in solution, based on butadiene or an acrylic ester or an EPDM elastomer as grafting base;     C: 1 to 40% by weight of a reinforcing agent C based on an inorganic glass, and also   D: 0.1 to 10% by weight of a copolymer D of, based on B, d 1  : 10 to 90% by weight of units of the formula I ##STR4## in which R 1  and R 2  are hydrogen or methyl and R 3  is hydrogen, C 1  -C 8  alkyl, C 5  -C 12  2-cycloalkyl or C 6  -C 16  aryl or C 6  -C 16  aralkyl, and   d 2  : 10 to 90% by weight of units derived from a copolymerizable monomer selected from styrene, α-methylstyrene, (meth) acrylonitrile or (meth)acrylic acid esters, with the proviso that the acid number S of the copolymer D is at least 0.5 meq/g..       
     
     
       2. A method of using the molding material as claimed in claim 1 for producing molded articles.